Processes and apparatus for deriving order-16 integer transforms
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United States of America Patent
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Aug 28, 2012
Grant Date -
Apr 30, 2009
app pub date -
Apr 9, 2008
filing date -
Oct 30, 2007
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Expired
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Abstract
Apparatus, systems and techniques based on an integer transform for encoding and decoding video or image signals, including apparatus, systems and techniques for deriving an order-16 integer transform from an order-8 integer transform in image and video coding. In some implementations, eight additions and eight subtractions are used to assign the data elements to be transformed to an intermediate matrix; and then two fast algorithms for the computation of the order-8 transform may be applied to the first 8 vectors of the intermediate matrix, and the last 8 vectors of the intermediate matrix, respectively. The derived order-16 integer transform tends to produce small magnitude and high frequency transformed coefficients, and thus achieve high compressibility.
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